Refrigeration dehumidification apparatus and control method thereof

Abstract

The application relates to the technical field of refrigeration and dehumidification equipment, and discloses a refrigeration and dehumidification equipment and a control method thereof. The refrigeration and dehumidification equipment comprises a compressor, a condenser, a throttling element and an evaporator; a compensation heat exchanger, a refrigerant inlet of the compensation heat exchanger is connected with a first pipeline through a second pipeline, a refrigerant outlet of the compensation heat exchanger is connected with the first pipeline through a third pipeline, and along the flowing direction of the refrigerant in the first pipeline, the connection position of the second pipeline and the first pipeline and the connection position of the third pipeline and the first pipeline are sequentially arranged, so that the compensation heat exchanger is connected with the first pipeline in parallel; a switch assembly is arranged on the second pipeline to control the on-off of the second pipeline and / or arranged on the third pipeline to control the on-off of the third pipeline. The pressure difference before and after the throttling element is small when the refrigeration mode and the dehumidification mode are realized, and the system runs stably.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration and dehumidification equipment, and particularly relates to a refrigeration and dehumidification equipment and a control method thereof. BACKGROUND

[0002] At present, the temperature and humidity in a room such as a germplasm resource library and a medicine cold storage are required to be controlled in a range. A traditional method is to configure one set of refrigeration equipment and one dehumidifier, and independently run according to the temperature and humidity. When the temperature in the room exceeds an upper limit value, the refrigeration equipment runs to perform refrigeration, and when the indoor temperature drops to a lower limit value, the refrigeration equipment stops. When the humidity in the room exceeds an upper limit value, the dehumidifier runs to perform dehumidification, and when the humidity in the cold storage drops to a lower limit value, the dehumidifier stops, so as to control the temperature and humidity in the room in the required range.

[0003] The temperature and humidity in the room are controlled by the independent running of the refrigeration equipment and the dehumidifier. When the temperature and humidity need to be controlled, the two sets of equipment run simultaneously, the power is large, the energy consumption is large, and the two sets of equipment need to occupy a larger space.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an overall description of the application, nor is it intended to identify key / important elements or delineate the scope of the embodiments, but to serve as a prelude to the detailed description below.

[0006] The embodiments of the present application provide a refrigeration and dehumidification equipment and a control method thereof, to solve the problem that two sets of equipment run simultaneously, the power is large, the energy consumption is large, and the two sets of equipment need to occupy a larger space in the related art.

[0007] According to a first aspect of the embodiments of the present application, a refrigeration and dehumidification device is provided, comprising: a compressor, a condenser, a throttling element and an evaporator, an exhaust port of the compressor being connected to a refrigerant inlet of the condenser through a first pipeline, a refrigerant outlet of the condenser being connected to an inlet of the throttling element, an outlet of the throttling element being connected to a first refrigerant inlet and outlet of the evaporator, and a second refrigerant inlet and outlet of the evaporator being connected to a return port of the compressor; a compensation heat exchanger, a refrigerant inlet of the compensation heat exchanger being connected to the first pipeline through a second pipeline, and a refrigerant outlet of the compensation heat exchanger being connected to the first pipeline through a third pipeline, and along the flow direction of the refrigerant in the first pipeline, the connection of the second pipeline to the first pipeline and the connection of the third pipeline to the first pipeline are sequentially arranged, so that the compensation heat exchanger is connected in parallel with the first pipeline; a switch assembly arranged on the second pipeline to control the opening and closing of the second pipeline and / or arranged on the third pipeline to control the opening and closing of the third pipeline.

[0008] Optionally, the heat exchange area of the compensation heat exchanger is 1 / 6-1 / 3 of the heat exchange area of the evaporator.

[0009] Optionally, the refrigeration and dehumidification device further comprises: an evaporative fan arranged corresponding to the compensation heat exchanger and / or the evaporator, for driving the airflow to flow from the evaporator to the compensation heat exchanger.

[0010] According to a second aspect of the embodiments of the present application, a control method is provided for controlling the refrigeration and dehumidification device as described in any of the above embodiments, the control method comprising: in the dehumidification mode, controlling the first pipeline to be turned on, and controlling the switch assembly to be opened, so that the second pipeline and the third pipeline are turned on.

[0011] Optionally, the control of the switch assembly to be opened comprises: controlling the switch assembly to be intermittently started and stopped.

[0012] Optionally, the control of the switch assembly to be intermittently started and stopped comprises:

[0013] detecting the indoor temperature at different times to obtain the change of the indoor temperature;

[0014] adjusting the length of time of the switch assembly being turned on and the length of time of the switch assembly being turned off according to the change of the indoor temperature.

[0015] Optionally, the adjustment of the length of time of the switch assembly being turned on and the length of time of the switch assembly being turned off according to the change of the indoor temperature comprises:

[0016] when the indoor temperature increases and the increase value is greater than a first preset temperature difference, increasing the length of time of the switch assembly being turned off and / or decreasing the length of time of the switch assembly being turned on;

[0017] when the indoor temperature decreases and the decrease value is less than a second preset temperature difference, decreasing the length of time of the switch assembly being turned off and / or increasing the length of time of the switch assembly being turned on.

[0018] Optionally, the control method further comprises:

[0019] obtaining the indoor temperature;

[0020] when the indoor temperature is less than or equal to the upper limit value of the cooling preset temperature range and greater than or equal to the lower limit value of the cooling preset temperature range, starting the cooling mode and determining whether to enter the dehumidification mode according to the indoor humidity;

[0021] when the indoor humidity is less than or equal to the upper limit value of the preset humidity range, maintaining the cooling mode;

[0022] when the indoor humidity is greater than the upper limit value of the preset humidity range and the indoor temperature is within the cooling preset temperature range, entering the dehumidification mode;

[0023] in the case of entering the dehumidification mode, obtaining the indoor temperature;

[0024] if the indoor temperature is greater than the upper limit value of the dehumidification preset temperature range, exiting the dehumidification mode and entering the cooling mode until the indoor temperature is lower than the upper limit value of the cooling preset temperature range again;

[0025] if the indoor temperature is less than the lower limit value of the dehumidification preset temperature range, stopping;

[0026] wherein the cooling preset temperature range is within the dehumidification preset temperature range.

[0027] Optionally, the control method further comprises:

[0028] in the cooling mode, controlling the evaporative fan to operate at a first rotating speed;

[0029] in the dehumidification mode, controlling the evaporative fan to operate at a second rotating speed;

[0030] wherein the second rotating speed is less than the first rotating speed.

[0031] Optionally, the control method further comprises:

[0032] in the defrosting mode, controlling the evaporative fan to be closed and / or controlling the air outlet of the indoor unit to be closed.

[0033] The refrigeration and dehumidification equipment and the control method thereof provided by the embodiments of the present disclosure can achieve the following technical effects:

[0034] in the cooling mode, the second pipeline and / or the third pipeline are controlled to be disconnected by the switching assembly, and the refrigerant in the compressor flows back to the gas inlet of the compressor through the exhaust port of the compressor, the first pipeline, the condenser, the throttling element and the evaporator, to realize refrigeration.

[0035] In dehumidification mode, the control switch assembly is turned on, the second and third pipelines are connected, and the refrigerant discharged from the compressor's exhaust port is divided into two parts. One part flows back to the compressor's return port through the compressor's exhaust port, the first pipeline, the condenser, the throttling element, and the evaporator. The other part flows back to the compressor's return port through the compensation heat exchanger, the condenser, the throttling element, and the evaporator.

[0036] In dehumidification mode, the refrigerant is completely condensed into a liquid after passing through the compensating heat exchanger and condenser. This improves the stability and efficiency of the throttling element. If condensation is incomplete and the refrigerant is not completely condensed into a liquid, it will remain a two-phase gas-liquid mixture before passing through the throttling element, causing instability factors such as valve core oscillation, uneven liquid distribution, and high noise. Furthermore, it stabilizes the pressure difference across the throttling element, ensuring a stable liquid supply to the refrigeration and dehumidification system. For example, if the refrigerant condenses after entering a -18°C environment, its pressure drops sharply, causing a sudden decrease in the pressure difference across the throttling element and reducing the liquid supply to the entire system. In this application, the refrigerant is cooled by the compensating heat exchanger before flowing into the condenser for heat exchange. The cooled refrigerant liquid in the condenser absorbs heat and then returns to the pressure corresponding to the ambient temperature. At this point, the pressure difference across the throttling element is smaller than that in the cooling mode, thus achieving a smaller change in pressure difference across the throttling element in both cooling and dehumidification modes, resulting in more stable system operation.

[0037] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0038] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0039] Figure 1 This is a schematic diagram of a refrigeration and dehumidification device in refrigeration mode according to an embodiment of this disclosure, wherein the solid arrows indicate the direction of refrigerant flow and the dashed arrows indicate the direction of air flow;

[0040] Figure 2 This is a schematic diagram of a refrigeration and dehumidification device in dehumidification mode according to an embodiment of this disclosure, wherein the solid arrows indicate the direction of refrigerant flow and the dashed arrows indicate the direction of air flow;

[0041] Figure 3 This is a schematic diagram of a refrigeration and dehumidification device in defrost mode according to an embodiment of this disclosure, wherein the solid arrow indicates the direction of refrigerant flow;

[0042] Figure 4This is a temperature and humidity diagram of points A, B, and C provided in an embodiment of this disclosure;

[0043] Figure 5 This is a flowchart of a control method provided in an embodiment of this disclosure;

[0044] Figure 6 This is a flowchart of another control method provided in an embodiment of this disclosure;

[0045] Figure 7 This is a schematic diagram of the structure of an indoor unit provided in an embodiment of this disclosure;

[0046] Figure 8 yes Figure 7 A sectional view along the DD direction.

[0047] Figure label:

[0048] 101. Compressor; 1012. Gas return port; 102. Condenser; 1021. Refrigerant inlet of condenser; 1022. Refrigerant outlet of condenser;

[0049] 103. Throttling element; 104. Evaporator; 1041. First refrigerant inlet / outlet of the evaporator; 1042. Second refrigerant inlet / outlet of the evaporator;

[0050] 105. Compensating heat exchanger; 1051. Refrigerant inlet of compensating heat exchanger; 1052. Refrigerant outlet of compensating heat exchanger; 106. Switch assembly; 107. Oil separator; 108. Liquid receiver; 109. First switch; 110. Second switch; 111. Third switch; 112. Fourth switch; 113. Fifth switch; 114. Sixth switch; 115. Gas-liquid separator; 116. Evaporator fan;

[0051] 116. First pipeline; 117. Second pipeline; 118. Third pipeline;

[0052] 119. Gap; 120. Indoor unit. Detailed Implementation

[0053] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0054] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0055] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0056] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0057] Unless otherwise stated, the term "multiple" means two or more.

[0058] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0059] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0061] Combination Figures 1-3 As shown, this embodiment of the present disclosure provides a refrigeration and dehumidification device, including a refrigeration and dehumidification system, which includes a compressor 101, a condenser 102, a throttling element 103, an evaporator 104, a compensating heat exchanger 105, and a switching assembly 106.

[0062] The discharge port of compressor 101 is connected to the refrigerant inlet 1021 of condenser through the first pipeline 116. The refrigerant outlet 1022 of condenser is connected to the inlet of throttling element 103. The outlet of throttling element 103 is connected to the first refrigerant inlet / outlet 1041 of evaporator. The second refrigerant inlet / outlet 1042 of evaporator is connected to the return port 1012 of compressor 101.

[0063] The refrigerant inlet 1051 of the compensating heat exchanger is connected to the first pipe 116 via the second pipe 117, and the refrigerant outlet 1052 of the compensating heat exchanger is connected to the first pipe 116 via the third pipe 118. The connection points of the second pipe 117 and the first pipe 116 and the third pipe 118 and the first pipe 116 are arranged sequentially along the refrigerant flow direction in the first pipe 116, so that the compensating heat exchanger 105 is connected in parallel with the first pipe 116.

[0064] The switch assembly 106 is provided in the second conduit 117 to control the on / off state of the second conduit 117 and / or provided in the third conduit 118 to control the on / off state of the third conduit 118.

[0065] The switching assembly 106 can be located in the second pipe 117, and the refrigerant can flow into the compensation heat exchanger 105 by controlling the opening and closing of the second pipe 117. Alternatively, it can be located in the third pipe 118, and the refrigerant in the compensation heat exchanger 105 can flow into the condenser 102 by controlling the opening and closing of the third pipe 118. Or, both the second pipe 117 and the third pipe 118 can be located in the switching assembly 106.

[0066] The switching assembly 106 can be a solenoid valve or other valve capable of controlling on / off states.

[0067] The refrigeration and dehumidification equipment also includes an oil separator 107, a liquid receiver 108, a first switch 109, a second switch 110, a third switch 111, a fourth switch 112, a fifth switch 113, a sixth switch 114, and a gas-liquid separator 115.

[0068] Taking the switch assembly 106 located in the second pipeline 117 as an example, the exhaust port of the compressor 101 is connected to the inlet of the oil separator 107. The outlet of the oil separator 107 is divided into three paths: the first path is connected to the inlet of the first switch 109, the outlet of the first switch 109 is connected to the refrigerant inlet 1021 of the condenser, the refrigerant outlet 1022 of the condenser is connected to the inlet of the liquid receiver 108, the outlet of the liquid receiver 108 is connected to the inlet of the fourth switch 112, the outlet of the fourth switch 112 is connected to the inlet of the throttling element 103, the outlet of the throttling element 103 is connected to the first refrigerant inlet / outlet 1041 of the evaporator, the second refrigerant inlet / outlet 1042 of the evaporator is connected to the inlet of the third switch 111, the outlet of the third switch 111 is connected to the inlet of the gas-liquid separator 115, and the outlet of the gas-liquid separator 115 is connected to the gas-liquid separator 115. The first path connects to the return port 1012 of the compressor 101; the second path connects to the inlet of the switch assembly 106, the outlet of the switch assembly 106 connects to the refrigerant inlet 1051 of the heat compensation heat exchanger, the refrigerant outlet 1052 of the heat compensation heat exchanger connects to the inlet of the sixth switch 114, and the outlet of the sixth switch 114 connects to the portion of the first pipeline 116 located between the outlet of the first switch 109 and the refrigerant inlet 1021 of the condenser; the third path connects to the inlet of the second switch 110, the outlet of the second switch 110 connects to the pipeline between the inlet of the third switch 111 and the outlet of the evaporator 104; the outlet of the fifth switch 113 connects to the inlet of the gas-liquid separator 115, and the inlet of the fifth switch 113 connects to the pipeline between the inlet of the throttling element 103 and the outlet of the fourth switch 112.

[0069] The first switch 109 to the fifth switch 113 can be a solenoid valve or other valve that can control the on / off state, and the sixth switch 114 can be a check valve or other valve.

[0070] The condenser 102 can be an air-cooled condenser 102. The refrigeration and dehumidification equipment also includes a condenser fan, which can be one or more, and can be a fixed-frequency fan. The throttling element 103 can be an electronic expansion valve (e.g., a two-way electronic expansion valve) or a capillary tube. The compressor 101 can be a variable-capacity regulating compressor 101. The evaporator 104 can be a cold air fan. The internal core of the evaporator 104 and the compensating heat exchanger 105 can both adopt a copper tube finned structure. The evaporator 104 and the compensating heat exchanger 105 can be an integrated structure or a separate structure.

[0071] The refrigeration and dehumidification equipment also includes an evaporator fan 116, which is configured to correspond to the compensating heat exchanger 105 and / or the evaporator 104, and is used to drive airflow from the evaporator 104 to the compensating heat exchanger 105.

[0072] The evaporator fan 116 has multiple fan speed settings. When the evaporator fan 116 is at the high fan speed setting, the evaporator fan 116 rotates faster; when the evaporator fan 116 is at the low fan speed setting, the evaporator fan 116 rotates slower.

[0073] likeFigure 5 and Figure 6 As shown, the refrigeration and dehumidification equipment includes an indoor unit 120, which comprises a compensating heat exchanger, an evaporator, and an evaporating fan. Figure 7 and Figure 8 As shown, the compensating heat exchanger and evaporator are arranged opposite each other, with a gap of 119 between them. The indoor unit can be installed in a cold storage or other area.

[0074] The refrigeration and dehumidification equipment also includes a controller, a temperature sensor, and a humidity sensor. The temperature sensor detects the indoor temperature, and the humidity sensor detects the indoor humidity. The temperature sensor, humidity sensor, first to fifth switches 113, switch assembly 106, compressor 101, condenser fan, and evaporator fan 116 are all connected to the controller. The controller controls the operation of the first to fifth switches 113, switch assembly 106, compressor 101, condenser fan, and evaporator fan 116 based on the detection data from the temperature sensor and / or humidity sensor.

[0075] The refrigeration and dehumidification equipment of this application can operate in refrigeration mode, dehumidification mode and defrosting mode.

[0076] like Figure 1 As shown, in refrigeration mode, the refrigerant flow direction is: compressor 101 exhaust port - oil separator 107 - first switch 109 - condenser 102 - liquid receiver 108 - fourth switch 112 - throttling element 103 - evaporator 104 - third switch 111 - gas-liquid separator 115 - compressor 101 return port 1012, forming a refrigeration flow path. At this time, the second switch 110, switch assembly 106, and fifth switch 113 are all closed. At the same time, the evaporator fan 116 is running at high speed and the condenser fan 102 is running.

[0077] like Figure 2 As shown, in dehumidification mode, the refrigerant flow is as follows: the refrigerant discharged from the exhaust port of compressor 101 flows through oil separator 107 and is divided into two paths. One path is the refrigeration path. Specifically, the refrigerant flows through the first switch 109-condenser 102-liquid receiver 108-fourth switch 112-throttling element 103-evaporator 104-third switch 111-gas-liquid separator 115-compressor 1011 return port 1012. At this time, the switch assembly 106 is turned on. The other path flows through the switch assembly 106, compensation heat exchanger 105, and sixth switch 114 into the refrigerant inlet 1021 of the condenser. At the same time, the evaporator fan 116 runs at a low speed until the current indoor humidity H is less than or equal to the preset lower humidity limit, at which point the switch assembly 106 is turned off. After the switch assembly 106 is turned on, the refrigerant enters the compensation heat exchanger 105 for heat exchange, and then enters the condenser 102 through the sixth switch 114, where it mixes with the refrigeration flow path. Throughout the entire dehumidification process, the second switch 110 and the fifth switch 113 remain in the closed state.

[0078] like Figure 3 As shown, in defrosting mode, the refrigerant flow direction is: compressor 101 exhaust port - oil separator 107 - second switch 110 - evaporator 104 - throttling element 103 - fifth switch 113 - gas-liquid separator 115 - compressor 1011 return port 1012. At this time, the first switch 109, switch assembly 106, third switch 111, and fourth switch 112 are all closed, and at the same time, the evaporator fan 116 and the condenser fan are both closed.

[0079] The evaporator 104 and the compensating heat exchanger 105 are located indoors, while the condenser 102 and the compressor 101 are located outdoors.

[0080] In dehumidification mode, the switch assembly 106 is turned on. On the one hand, the refrigerant releases heat in the compensation heat exchanger 105 to heat the indoor temperature; on the other hand, the hot refrigerant flowing out of the compensation heat exchanger 105 enters the condenser 102, and the evaporator fan 116 drives the indoor air through the evaporator 104 to the compensation heat exchanger 105 to heat the air, thereby achieving thermal compensation for the indoor air and preventing the indoor temperature from being too low.

[0081] In dehumidification mode, the refrigerant is completely condensed into a liquid after passing through the compensating heat exchanger 105 and condenser 102. This improves the stability and efficiency of the throttling element 103. If condensation is incomplete and the refrigerant is not completely condensed into a liquid, the refrigerant will be in a two-phase state before passing through the throttling element 103, causing instability factors such as valve core oscillation, uneven liquid distribution, and high noise. On the other hand, it also stabilizes the pressure difference before and after the throttling element 103, ensuring a stable liquid supply to the refrigeration and dehumidification system. For example, the refrigerant dissipates heat after entering a -18°C environment. After condensation, the pressure drops sharply, and the pressure difference across the throttling element 103 suddenly decreases, resulting in a reduction in the liquid supply in the entire refrigeration and dehumidification system. In this application, the refrigerant is cooled by the heat exchanger 105 before flowing into the condenser 102 for heat exchange. At this time, the refrigerant liquid cooled in the condenser 102 is heat-absorbing. After absorbing heat, it returns to the pressure corresponding to the ambient temperature. At this time, the pressure difference across the throttling element 103 corresponding to the refrigeration mode is small. This achieves a small change in the pressure difference across the throttling element 103 in both refrigeration and dehumidification modes, and the system operates more stably.

[0082] Optionally, the heat exchange area of ​​the compensation heat exchanger 105 is 1 / 6 to 1 / 3 of the heat exchange area of ​​the evaporator 104, for example, 1 / 6, 1 / 5, 1 / 4 or 1 / 3.

[0083] When the heat exchange area of ​​the compensating heat exchanger 105 is less than 1 / 6 of the heat exchanger area of ​​the evaporator 104, the heating capacity of the compensating heat exchanger 105 for indoor air will be limited, potentially causing the indoor temperature to be lower than the preset temperature range. When the heat exchange area of ​​the compensating heat exchanger 105 is greater than 1 / 3 of the heat exchanger area of ​​the evaporator 104, the heating capacity of the compensating heat exchanger 105 for indoor air will be excessive, causing the indoor air temperature to exceed the preset temperature range. This will also lead to a larger refrigerant charge in the refrigeration and dehumidification system and a sudden change in pressure difference before the throttling element 103. The preset temperature range can be either the dehumidification preset temperature range or the refrigeration preset temperature range.

[0084] This application also provides a control method for controlling a refrigeration and dehumidification device as described in any of the above embodiments, such as... Figure 5 As shown, the control methods include:

[0085] In step S501, under dehumidification mode, the controller controls the first pipe 116 to be turned on and controls the switch assembly 106 to be turned on, so that the second pipe 117 and the third pipe 118 are turned on.

[0086] In dehumidification mode, the first pipe 116 is open, and the refrigerant discharged from the compressor 101 flows through the first pipe 116, the condenser 102, and into the evaporator 104, forming a refrigeration flow path to cool the indoor air and thus achieve dehumidification. When the control switch assembly 106 is turned on, the refrigerant discharged from the compressor 101 flows through the compensation heat exchanger 105 into the condenser 102, participating in the refrigeration flow path.

[0087] The dehumidification process is still a cooling process, so the cooling mode still exists in the dehumidification mode. However, after the dehumidification mode is started, the refrigerant enters the compensation heat exchanger 105 and releases heat in the room to compensate for the heat of the indoor air, thus achieving the purpose of dehumidification.

[0088] In step S501, the controller controls the switch assembly 106 to open, including: the controller controls the switch assembly 106 to start and stop intermittently.

[0089] During dehumidification, the indoor temperature must remain within a preset temperature range, which is the dehumidification preset temperature range. If refrigerant continuously flows into the compensating heat exchanger 105, it will continuously heat the indoor air, resulting in a localized increase in indoor temperature. The switching component 106 will intermittently start and stop, opening for a seconds and closing for b seconds, repeatedly opening and closing to achieve intermittent heating of the indoor air by the compensating heat exchanger 105. This will cause the hot air to circulate indoors, making the indoor air temperature and humidity more uniform.

[0090] The controller controls the intermittent start and stop of the switch assembly 106, including:

[0091] The controller detects the indoor temperature at different times to obtain the changes in indoor temperature;

[0092] The controller adjusts the opening and closing durations of the 106 switch components according to changes in indoor temperature.

[0093] The system detects the indoor temperature at different times to obtain the change in indoor temperature over time and to obtain the trend of indoor temperature change; it adjusts the values ​​of a and b according to the change in indoor temperature to maintain the indoor temperature within the preset temperature range while dehumidifying. The preset temperature range is the dehumidification preset temperature range.

[0094] Adjusting the on and off durations of switch components 106 according to changes in indoor temperature, including:

[0095] When the indoor temperature rises and the rise exceeds the first preset temperature difference, the controller increases the duration of the switch assembly 106 being closed and / or decreases the duration of the switch assembly 106 being open.

[0096] When the indoor temperature decreases and the decrease is less than the second preset temperature difference, the controller reduces the duration of the switch assembly 106 being closed and / or increases the duration of the switch assembly 106 being open.

[0097] When the indoor temperature rises and the rise is greater than the first preset temperature difference, it indicates that the indoor temperature is rising rapidly. The duration b of the switch component 106 being closed is increased and / or the duration a of the switch component 106 being opened is decreased to reduce the rate at which the indoor temperature rises. When the indoor temperature falls and the fall is less than the second preset temperature difference, it indicates that the indoor temperature is falling rapidly. The duration b of the switch component 106 being closed is decreased and / or the duration a of the switch component 106 being opened is increased to reduce the rate at which the indoor temperature falls.

[0098] When the indoor temperature rises but the rise is less than or equal to the first preset temperature difference, or when the indoor temperature falls but the fall is less than or equal to the second preset temperature difference, or when the indoor temperature does not change over time, the duration b of the switch assembly 106 being closed and / or the duration a of being open shall not be adjusted.

[0099] To more accurately capture changes in indoor temperature, the indoor temperature is acquired at each preset time interval to obtain the indoor temperature at different times. Taking the indoor temperature at time T1 as an example, the indoor temperature at time T1 is calculated by taking the current indoor temperature at time T1 and the average of the N most recent indoor temperatures before time T1, where N is a positive integer.

[0100] For example, a = 120s, b = 60s. Record the indoor temperature every 30s to obtain multiple indoor temperature values. Take the current indoor temperature at time T1 and the average of the two most recent indoor temperatures before time T1 as the indoor temperature at time T1. Then record the indoor temperature every 30s to obtain multiple indoor temperature values. Take the current indoor temperature at time T2 and the average of the two most recent indoor temperatures before time T2 as the indoor temperature at time T2. If the difference between the indoor temperature at time T2 and the indoor temperature at time T1 is greater than the first preset temperature difference, it indicates that the indoor temperature has increased and the increase is greater than the first preset temperature difference. Therefore, the duration of the switch component 106 being closed should be increased and / or the duration of the switch component 106 being open should be decreased. For example, b should be adjusted to 70s while a remains unchanged. If the difference between the indoor temperature at time T2 and the indoor temperature at time T1 is less than the second preset temperature difference, it indicates that the indoor temperature has decreased and the decrease is less than the second preset temperature difference. Therefore, the duration of the switch component 106 being closed should be decreased and / or the duration of the switch component 106 being open should be increased. For example, b should be adjusted to 50s while a remains unchanged.

[0101] The adjusted values ​​of a and b need to be recorded and saved as parameters for the next program execution.

[0102] The conditions for exiting dehumidification mode are:

[0103] When the indoor temperature is within the preset dehumidification temperature range or the preset cooling temperature range, if the indoor humidity is lower than the preset humidity lower limit and remains below the preset humidity lower limit for a preset time, such as 10 seconds, the dehumidification mode will be exited; or, if the indoor temperature exceeds the upper limit of the preset indoor temperature range and the difference between the two is greater than or equal to the preset value (the preset value is greater than or equal to 0, such as 0.5℃), the dehumidification mode will be exited regardless of the indoor temperature.

[0104] Set preset temperature ranges for cooling and dehumidification. The upper limit of the preset temperature range for cooling is lower than the upper limit of the preset temperature range for dehumidification, and the lower limit of the preset temperature range for cooling is higher than the upper limit of the preset temperature range for dehumidification. For example, set the preset temperature range for cooling to [-19℃, -17℃], with an upper limit of -17℃. Set the preset temperature range for dehumidification to [-19.5℃, -16.5℃], with an upper limit of -16.5℃. This allows for greater freedom and wider range of indoor temperature adjustment in dehumidification mode, and the dehumidification process lasts longer for better dehumidification.

[0105] When the indoor temperature is less than or equal to the upper limit of the preset cooling temperature range (e.g., -17℃) and greater than or equal to the lower limit of the preset cooling temperature range (e.g., -19℃), i.e. when the indoor temperature is within the preset cooling temperature range, the cooling mode is turned on, and the indoor humidity is acquired and the dehumidification mode is switched based on the indoor humidity. When the indoor humidity is less than or equal to the upper limit of the preset humidity range, the cooling mode is maintained and the dehumidification mode is not switched until the indoor temperature is lower than the lower limit of the preset cooling temperature range (e.g., -19℃). The machine will stop when the indoor temperature is lower than the lower limit of the preset cooling temperature range. When the indoor humidity is greater than the upper limit of the preset humidity range and the indoor temperature is within the preset cooling temperature range, the machine will switch to dehumidification mode. While in dehumidification mode, the indoor temperature will be detected. If the indoor temperature is greater than the upper limit of the preset dehumidification temperature range (e.g., -16.5℃), the dehumidification mode will be exited and the cooling mode will be entered until the indoor temperature is again lower than the upper limit of the preset cooling temperature range (e.g., -17℃). If the indoor temperature is lower than the lower limit of the preset dehumidification temperature range (e.g., -19.5℃), the machine will stop.

[0106] When the indoor temperature is higher than the upper limit of the preset cooling temperature range (e.g., -17℃), the cooling mode is activated and the dehumidification mode is turned off. The cooling mode is used to lower the temperature so that the indoor temperature can be reduced as quickly as possible.

[0107] When the indoor temperature is below the lower limit of the preset cooling temperature range (e.g., -19℃), the cooling mode is turned off to prevent the indoor temperature from becoming too low. When the indoor temperature returns to the preset cooling temperature range, the cooling mode is turned on, and the indoor humidity is acquired to determine whether to switch to dehumidification mode.

[0108] Control methods also include:

[0109] In cooling mode, the evaporator fan 116 is controlled to run at the first speed;

[0110] In dehumidification mode, control the evaporator fan 116 to run at the second speed;

[0111] The second rotational speed is less than the first rotational speed.

[0112] In cooling mode, the evaporator fan 116 operates at its first speed, such as a high speed, which encourages more air to exchange heat with the evaporator 104 per unit time, thus increasing the cooling speed. In dehumidification mode, the temperature of the evaporator 104 surface is reduced, resulting in a good cooling effect. It also promotes indoor air circulation and enhances the uniformity of indoor air temperature and humidity. Moreover, the evaporator fan 116 operates at a lower second speed, so it removes less water vapor, ensuring that sufficient water vapor can condense on the surface of the evaporator 104. This ensures a better dehumidification effect, thus achieving both cooling and dehumidification, maintaining both indoor temperature and humidity.

[0113] Control methods also include:

[0114] In cooling mode, the temperature difference between the evaporation temperature of the cooling and dehumidification system and the indoor temperature is defined as the first temperature difference.

[0115] In dehumidification mode, the temperature difference between the evaporation temperature of the refrigeration dehumidification system and the indoor temperature is controlled as the second temperature difference;

[0116] The second temperature difference is greater than the first temperature difference. For example, if the first temperature difference is 5-8℃ and the second temperature difference is 12-18℃, the system can efficiently achieve cooling and dehumidification.

[0117] like Figure 2 In the cooling and dehumidifying equipment, three points A, B, and C are selected. Point A is located on the side of the evaporator away from the compensating heat exchanger, point B is located between the evaporator and the compensating heat exchanger, and point C is located on the side of the compensating heat exchanger away from the evaporator. Taking a preset cooling temperature range of [-20℃, -16℃] and a preset humidity range of less than or equal to 45% as an example, the temperature and humidity values ​​at points A, B, and C are measured in both cooling and dehumidifying modes as follows: Figure 4 As shown.

[0118] In cooling mode, the throttling element 103 automatically adjusts according to the superheat, and the compressor 101 adjusts its capacity automatically according to the evaporation pressure corresponding to the evaporation temperature.

[0119] In dehumidification mode, the throttling element automatically adjusts according to the superheat, and the compressor 101 automatically adjusts its capacity according to the evaporation pressure corresponding to the evaporation temperature.

[0120] like Figure 6 As shown, the control methods for refrigeration and dehumidification equipment include:

[0121] Step S601: Obtain the indoor temperature;

[0122] In step S602, when the indoor temperature is greater than the upper limit of the preset cooling temperature range (e.g., -17℃), the cooling mode is activated. The condenser fan and the first switch 109 are turned on first. After running for a specified time, the third switch 111, the fourth switch 112, the evaporator fan 116, and the compressor 101 are turned on simultaneously. After the throttling element 103 is pre-opened at K=KB (10%), it is then run according to the superheat program. The compressor 101 is first started and run at the power frequency, and then cooled down according to the variable frequency program until it drops to the lower limit of the preset cooling temperature range.

[0123] Step S603: When the indoor temperature is less than or equal to the upper limit of the preset cooling temperature range (e.g., -17℃) and greater than or equal to the upper limit of the preset cooling temperature range (e.g., -19℃), obtain the indoor humidity:

[0124] Step S604: When the preset lower humidity limit ≤ indoor humidity H ≤ preset upper humidity limit, the cooling mode is run. The condenser fan, the first switch 109, the fourth switch 112, and the third switch 111 remain open. The compressor 101 continues to run according to the frequency conversion program, and the throttling element 103 continues to run according to the superheat program.

[0125] Step S605: When the indoor humidity H > the preset upper limit of humidity, the dehumidification mode is run. The condenser fan, the first switch 109, the third switch 111, and the fourth switch 112 remain open. The switch assembly 106 is closed for b seconds and then opened for a seconds. This process is repeated until the indoor humidity is lower than the preset lower limit of humidity. After the humidity is lower than the lower limit, the switch assembly 106 remains closed, and the compressor 101 continues to operate according to the frequency conversion program.

[0126] Step S606: When the indoor humidity H < the preset lower limit value, the cooling mode is run. The condenser fan, the first switch 109, the fourth switch 112, and the third switch 111 remain open. The switch assembly 106 is closed. The evaporator fan 116 runs at the high level. The compressor 101 is controlled by the frequency conversion program. The throttling element 103 continues to run according to the superheat program.

[0127] In step S607, when the indoor temperature T is less than the lower limit of the preset cooling temperature range, the compressor 101, the fourth switch 112, the third switch 111, and the evaporator fan 116 are simultaneously turned off, and the throttling element 103 is turned off (step number is 0). After a predetermined running time, the condenser fan, the evaporator fan 116, and the first switch 109 are turned off, and the refrigeration and dehumidification equipment stops.

[0128] After the unit has been running continuously for a set time in dehumidification mode and / or cooling mode, or when the frost layer on the surface of evaporator 104 reaches a preset amount, defrosting mode is activated. After defrosting is completed, the unit stops, and the system monitors the indoor temperature again in real time.

[0129] For example, after the dehumidification mode and / or cooling mode have been running for a cumulative 24 hours, the system operating status is first determined. If the cooling and dehumidification system has not started, it waits. If the compressor 101 is running, it enters the defrosting mode the moment the cooling mode or dehumidification mode ends, while keeping the compressor 101 running.

[0130] After entering defrost mode, compressor 101 is adjusted to its rated frequency (e.g., 50Hz), while throttling element 103 is fully open. Simultaneously, evaporator fan 116 and condenser fan are closed. When the cumulative running time exceeds a preset duration or the temperature after throttling element 103 reaches or exceeds a specified temperature, second switch 110, fifth switch 113, and compressor 101 are closed, and throttling element 103 is reduced to 0. After a set static time, the water tray heater and drain pipe heating tape are turned off, and then the process proceeds to obtain the indoor temperature. The water tray is located below evaporator 104 and is used to collect defrost water generated from the melting of frost on the surface of evaporator 104. The water tray heater is used to heat the water tray, and a drain pipe is connected to the water tray to discharge the defrost water.

[0131] In cooling and dehumidification modes, multiple condenser fans are started in batches according to the difference between the exhaust pressure P1 and the suction pressure P2 supplied to the compressor 101 (supply pressure difference).

[0132] When the pressure difference (P1-P2) is greater than the preset pressure difference range, a judgment is made after a preset time. If (P1-P2) is greater than the preset pressure difference range, one condenser fan is turned on. After a preset time, the judgment is made again. If (P1-P2) is greater than the preset pressure difference range, another condenser fan is turned on. The judgment is repeated until all condenser fans are turned on.

[0133] When the pressure difference (P1-P2) is less than the preset pressure difference range, a judgment is made after a preset time. If (P1-P2) is less than the preset pressure difference range, one condenser fan is turned off. After a preset time, the judgment is made again. If (P1-P2) is less than the preset pressure difference range, another condenser fan is turned off. The judgment is repeated until all condenser fans are turned off.

[0134] When the pressure difference (P1-P2) is within the preset pressure difference range, the number of condenser fans that are turned on remains unchanged.

[0135] The control method also includes: in defrost mode, controlling the evaporator fan 116 to shut down and / or controlling the air outlet of the indoor unit to shut down.

[0136] During defrosting, the air exchanges heat with the evaporator 104 to form hot air, which controls the evaporator fan 116 to shut off and / or controls the air outlet of the indoor unit to shut off, preventing hot air from escaping into the room and affecting the indoor temperature.

[0137] Optionally, the air outlet of the evaporator fan 116 is fitted with a cloth bag duct. When the evaporator fan 116 stops operating, the cloth bag duct hangs down due to gravity, covering the air outlet of the evaporator fan 116 to prevent hot air from escaping.

[0138] In defrosting mode, the evaporator fan 116 stops running, the throttling element 103 automatically adjusts according to the superheat, and the compressor 101 runs at the industrial frequency.

[0139] In summary, the refrigeration mode in this application employs a small temperature difference control logic, enabling the refrigeration and dehumidification system to operate efficiently under higher evaporation pressure, thus achieving energy savings. The dehumidification mode utilizes a large temperature difference control logic within a small temperature control range, promptly capturing air moisture molecules. The large temperature difference heat exchange fully captures water vapor while simultaneously providing efficient dehumidification with high-temperature hot air, minimizing the dehumidification process time. The compensating heat exchanger 105 employs an intermittent heat replenishment method, reducing unit operating time while maintaining effective temperature and humidity control, further enhancing energy savings. Moreover, the intermittent direct start-stop of the compensating heat exchanger 105 and reduced speed of the evaporator fan 116 achieve efficient dehumidification while controlling temperature, significantly reducing the heat exchange area (number of coils) of the compensating heat exchanger 105 and resolving the refrigerant shortage problem during operation. The defrosting mode still uses the heat from the refrigeration and dehumidification system for defrosting, maximizing energy savings.

[0140] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A refrigeration dehumidifying apparatus characterized by comprising: Comprises: a compressor, a condenser, a throttling element and an evaporator, the exhaust port of the compressor is connected with the refrigerant inlet of the condenser through a first pipeline, the refrigerant outlet of the condenser is connected with the inlet of the throttling element, the outlet of the throttling element is connected with the first refrigerant inlet and outlet of the evaporator, and the second refrigerant inlet and outlet of the evaporator are connected with the gas inlet of the compressor; A compensation heat exchanger, the refrigerant inlet of the compensation heat exchanger is connected with the first pipeline through a second pipeline, the refrigerant outlet of the compensation heat exchanger is connected with the first pipeline through a third pipeline, and along the flow direction of the refrigerant in the first pipeline, the connection of the second pipeline and the first pipeline and the connection of the third pipeline and the first pipeline are sequentially arranged, so that the compensation heat exchanger is connected with the first pipeline in parallel; A switch assembly is arranged on the second pipeline to control the opening and closing of the second pipeline and / or arranged on the third pipeline to control the opening and closing of the third pipeline.

2. The refrigeration and dehumidification device according to claim 1, wherein the heat exchange area of the compensation heat exchanger is 1 / 6-1 / 3 of the heat exchange area of the evaporator. Further comprising:

3. The refrigeration dehumidifying apparatus according to claim 1 or 2, characterized by, An evaporative fan is arranged corresponding to the compensation heat exchanger and / or the evaporator, and is used to drive the airflow to flow from the evaporator to the compensation heat exchanger. A control method for the refrigeration and dehumidification device according to any one of claims 1-3, the control method comprising:

4. A control method characterized by, In the dehumidification mode, the first pipeline is controlled to be conducted, and the switch assembly is controlled to be opened to make the second pipeline and the third pipeline conducted. The control method comprises:

5. The control method according to claim 4, characterized by The switch assembly is controlled to be intermittently started and stopped.

6. The control method according to claim 5, wherein the switch assembly is controlled to be intermittently started and stopped, comprising: Detecting the indoor temperature at different times to obtain the change of the indoor temperature; Adjusting the time length of opening and the time length of closing of the switch assembly according to the change of the indoor temperature. The control method comprises: When the indoor temperature rises and the rising value is greater than a first preset temperature difference, the time length of closing of the switch assembly is increased and / or the time length of opening of the switch assembly is decreased; 7. The control method according to claim 6, characterized by When the indoor temperature decreases and the decreasing value is less than a second preset temperature difference, the time length of closing of the switch assembly is decreased and / or the time length of opening of the switch assembly is increased. Further comprising: Obtaining the indoor temperature; 8. The control method according to any one of claims 4 to 7, characterized by, When the indoor temperature is less than or equal to the upper limit value of a refrigeration preset temperature range and greater than or equal to the lower limit value of the refrigeration preset temperature range, the refrigeration mode is started, and whether to enter the dehumidification mode is determined according to the indoor humidity; When the indoor humidity is less than or equal to the upper limit value of a preset humidity range, the refrigeration mode is maintained; When the indoor humidity is greater than the upper limit value of the preset humidity range and the indoor temperature is within the refrigeration preset temperature range, the dehumidification mode is entered; In the case of entering the dehumidification mode, the indoor temperature is obtained; If the indoor temperature is greater than the upper limit value of a dehumidification preset temperature range, the dehumidification mode is exited, and the refrigeration mode is entered until the indoor temperature is lower than the upper limit value of the refrigeration preset temperature range again; If the indoor temperature is less than the lower limit value of the dehumidification preset temperature range, the device is stopped; The refrigeration preset temperature range is within the dehumidification preset temperature range. Further comprising: In the refrigeration mode, the evaporative fan is controlled to operate at a first rotating speed; 9. The control method according to any one of claims 4 to 7, characterized by, In the dehumidification mode, the evaporative fan is controlled to operate at a second rotating speed; ​ ​ The second rotating speed is less than the first rotating speed.

10. The control method according to any one of claims 4 to 7, characterized by, Further comprising: In the defrosting mode, the evaporating fan is controlled to be closed and / or the air outlet of the indoor unit is controlled to be closed.

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